char *
ft_strnstr(const char *big, const char *little, size_t len) {
	char *b;

	b = (char *)big;
	if (!*little || (little == big && ft_strlen(little) <= len))
		return (b);
    u32 y;
    for (u32 i = 0; i < len && big[i]; i++) {
		y = 0;
		while (b[i + y] == little[y] && i + y < len)
		{
			y++;
			if (little[y] == '\0')
				return (&b[i]);
		}
	}
	return (NULL);
}